50EES--ZP (50Hz) Single Package Air Conditioners 3-5 Nominal Tons Product Data The 50EES unit with ZP technology is a package air conditioner for manufactured housing, residential, and light commercial applications. The 50EES unit design is the result of our firm commitment to the development of the finest air conditioners that modern technology can offer. The 50EES unit is built in one basic cabinet size and features rectangular duct configuration on sizes 035-060. Features/Benefits FACTORY-ASSEMBLED PACKAGE is a compact, fully self-contained, electric cooling unit with horizontal supply and return ducts. The 50EES units are available in a variety of standard cooling sizes with voltage options to meet residential and light commercial requirements. Unit installs easily on a ground level pad. EASY TO INSTALL 50EES units are small, compact, and easy to handle. Every 50EES unit has an identical 32 x 51-in. footprint to make planning simple. The concise design uses less sheet metal and makes the 50EES units lighter than other units. The unit can be easily positioned on the jobsite with the hand holds built into the unit basepan. Drop-in cartridge style heaters are utilized to minimize installation time. The 50EES unit was designed with potential safety hazards in mind; with no sharp edges or corners which could injure a worker. NEW IMPROVED AERODYNAMIC FAN BLADE DESIGN reduces the overall sound by up to 6dB; now as low as 78dB. TOP COVER SERVICE ACCESS Makes installation and maintenance quicker and easier. The 50EES units are designed to be serviced from the top. The split-top design allows easy access for installation and maintenance procedures of the unit. Routine maintenance tasks such as coil cleaning are sped up with through-thetop access. Multiple side panels do not need to be removed as with other units. NO-RUST BASEPAN WITH INTEGRATED DRAIN PAN Is standard on all units. The 50EES units feature a toug hightech, composite material basepan with integrated drain pan. The composite material eliminates the potential problems of rust and premature replacement which are common with standard metal basepans. Durable oven backed polyester powder painted galvanized steel) protects against harsh weather. -02 PD 2008
I The watertight construction and corrosion- performance level can reduce cooling expenses sizes range from 5.0 to 20.0 kw. Design allows resistant finish of the 50EES unit will by as much as 25% compared to older cooling for single-point supply for entire unit. Heaters keep it looking like new for years. The paint equipment. A high-eficiency, multi-speed provide heating capability when required. treatment process ensures quality protection against the elements. A compact, low-profile design utilizes an expandedmetal coil grill to make coil cleaning easy. blower motor system ensures quality performance with most duct systems. The computer-designed blower wheel is balanced for quiet operation. Corporate Thermostat These provide cooling control for unit. Autochangeover and manual changeover types are available. INDOOR AIR QUALITY is designed into the DURABLE, DEPENDABLE, The MotorMaster II Low Ambient Kit Kit 50EES units. A sloped drain pan minimizes the COMPRESSORS are designed for high permits operation down to 0 F. Use when amount of standing water inside the unit, which efficiency. Each compressor is hermetically mechanical cooling is required when outdoor- limits mold and mildew growth. The drain pan sealed against contamination to help promote air temperature is between 40 F and 0 F. is made of a rust-proof material and will not longer life and dependable operation. Vibration Crankcase Heater Warms crankcase oil to deteriorate or release foreign matter into the isolation provides quiet operation. Compressors reduce refrigerant migration and ensure proper airstream. have internal high-pressure and overcurrent compressor lubrication. protection. LIGHTWEIGHT, COMPACT CONSTRUCTION is ideal for manufactured DIRECT-DRIVE MULTISPEED, PSC Solid-State Time Guard Device Package housing and residential applications. The 50EES (PERMANENT SPLIT CAPACITOR) consists of a control to be field-wired into the unit is one of the lightest, most compact BLOWER MOTOR is standard on all models. unit controls, and provides a 5-minute delay in packaged units ever designed. It s light weight Direct-drive, PSC condenser-fan motors are compressor operation between cooling cycles. (250 lbs for the 50EES 035 unit) makes the unit designed to help reduce energy consumption Prevents compressor short cycling when rapid easier to handle. The low height keeps ductwork and provide for cooling operation down to 40 F. compressor cycles may be a problem. connections to a minimum and makes units less visible. REFRIGERANT SYSTEM is designed to Controls Upgrade Kit Contains high- and provide dependability. Liquid refrigerant low-pressure switches to protect the unit from The 50EES units utilize a structural beam design strainers are used to promote clean, unrestricted running at unsuitable pressures. Provides to form the four sides of the cabinet. Only 12 operation. Each unit leaves the factory with a additional safety features when needed. different pieces of sheet metal are used in the full refrigerant charge. Refrigerant service unit construction to simplify the unit for greater connections make checking operating pressures Outdoor Thermostat Accessory provides reliability. easier. control when outdoor-air temperature falls below set point. Helps to bring second stage of EFFICIENT, DEPENDABLE FIELD-INSTALLED ACCESSORY 2-stage electric heater on line. PERFORMANCE with durable compressors DESCRIPTION AND USAGE designed for efficiency. The 50EES units offer 9.5 SEER (Seasonal Energy Efficiency Ratio) Electric Heater Heater module slides into cooling performance efficiencies. This keyed mounting slots in the fan inlet. Heater ARI* capacity ratings UNIT NET COOLING CAPACITY STANDARD SEER** SOUND RATINGS (db) 035 34,200 1200 9.5 78 040 40,000 1400 9.5 78 050 46,000 1600 9.5 78 060 57,000 2000 9.5 80 A2 325 MANUFACTURER CERTIFIED TO ARI AS COMPLYING WITH ARI UNITARY EQUIPMENT AIR CONDITION NG STANDARD 210 db db LEGEND Dry Bulb decibels ** All units have factory-installed time-delay relay. Rated in accordance with ARI Standard 270-84. SEER Seasonal Energy Efficiency Ratio NOTES: wb Wet Bulb 1. Ratings are net values, reflecting the effects of circulating fan heat. Cooling capacity ratings are based on cooling standard: 80 F db/67 F wb indoor air entering temperature 95 F db air entering outdoor unit * Air Conditioning & Refrigeration Institute. 2. Rated in accordance with U.S. Government DOE Department of Energy) test procedures and/or ARI Standard 210/240-89. Table of contents Page Features/Benefits........................................................................................................... 1 ARI Capacity Ratings........................................................................................................ 2 Model Nomenclature........................................................................................................ 3 Physical Data.............................................................................................................. 3 Dimensional Drawings..................................................................................................... 4-7 Selection Procedure......................................................................................................... 8 Performance Data........................................................................................................ 9-12 Typical Wiring Schematics...................................................................................................13 Electrical Data......................................................................................................... 14, 15 Operating Sequence........................................................................................................ 16 Typical Installation......................................................................................................... 16 Application Data........................................................................................................... 17 Engineers Specification Guide............................................................................................... 18 2
MODEL NUMBER NOMENCLATURE 50EES 035 9 1 3 ZP Model No. 50EES Single Package Air Conditioner SAMCO (ZP Variation) Nominal Cooling Capacity 035 3 Tons 040 3-1/2 Tons 050 4 Tons 060 5 Tons Brand Name 3 Common Unit. Design Series 1 Original. N/A Electrical Supply 9 360/440-3-50 Physical data UNIT SIZE 50EES -ZP 035 040 050 060 OPERATING WEIGHT (lb) 250 297 310 368 COMPRESSOR TYPE Reciprocating REFRIGERANT R 22 CHARGE (lb) 4.2 5.0 6.1 8.1 REFRIGERANT METERING DEVICE Acutrol System CONDENSER COIL Rows Fins/in. Total Copper Tubes, Aluminum Plate Fins Face Area (sq ft) 2 17 6.2 1 17 11.1 2 17 8.6 2 17 10.7 CONDENSER MOTOR FAN Propeller Condenser Cfm Nominal Rpm Motor Hp (Rpm) Diameter (in.) 2200 1100 1/4 20 2800 1100 1/4 20 2800 1100 1/4 20 3000 1100 1/4 20 EVAPORATOR COIL Copper Tubes, Aluminum Plate Fins Rows Fins/in. Total Face Area (sq ft) EVAPORATOR FAN MOTOR Blower Motor Size (in.) Nominal Cfm Rpm Range Number of Speeds Factory Speed Setting Motor Hp 3 15 3.1 10 X 8 1200 800 1050 3 Low 1/2 3 15 3.9 10 X 9 1400 800 1050 3 Med 1/2 3 15 4.3 Direct Drive 10 X 9 1600 100 1100 2 Low 3/4 4 15 4.9 10 X 10 2300 950 1100 2 Low 1 CONNECTING DUCT SIZES Square Supply Air (in.) Return Air (in.) 13.9 x 13.9 13.9 x 13.9 13.9 x 19 13.9 x 32 FIELD-SUPPLIED RETURN AIR FILTER* Throwaway 24 x 24 x 1 24 x 24 x 1 24 x 30 x 1 24 x 30 x 1 * Required filter sizes shown are based on the ARI (Air Conditioning & Refrigeration Institute) rated airflow at a velocity of 300 ft/minute for throwaway type or 450 ft/minute for high-capacity type. Recommended filters are 1-in. thick. 3
Dimensional drawings 50EES 035 ZP 4
Dimensional drawings 50EES 040 ZP 5
Dimensional drawings 50EES 050 ZP 6
Dimensional drawings 50EES 060 ZP 7
Selection Procedure I DETERMINE COOLING AND HEATING REQUIREMENTS AT DESIGN CONDITIONS. Given: Required Cooling Capacity (TC)..........34,000 Btuh Sensible Heat Capacity (SHC)............25,000 Btuh Required Heating Capacity...............15,000 Btuh Outdoor Entering-Air Temperature..............95 F Indoor Entering-Air Temperature....80 F edb; 67 F ewb Indoor-Air Quantity...................... 1200 cfm External Static Pressure..................0.20 in. wg Electrical Characteristics (V-Ph-Hz)......... 400-3-50 II SELECT UNIT BASED ON REQUIRED COOLING CAPACITY. Enter Cooling Capacities table at condenser entering temperature of 95 F, indoor air entering at 1200 cfm and 67 F ewb. The 50EES035 unit provides a total cooling capacity of 34,200 Btuh and a sensible heat capacity of 25,300 Btuh. For indoor-air temperature other than 80 F edb, calculate sensible heat capacity correction, as required, using the formula found in Note 3 following the Cooling Capacities tables. NOTE: Unit ratings are net capacities. III SELECT ELECTRIC HEAT. The required heating capacity is 15,000 Btuh (given). Determine the electric heat capacity in kw. 15,000 Btuh = 3.8 kw of heat required 3414 Btuh/kW Enter the Accessory Electric Heater table on page 18 400 v. 3ph. 50EES 035 unit. The 5-kW heater at 400v most closely satisfies the heating required to calculate kw at 400 V, multiply the heater kw by multiplication factor 0.75 found in the Multiplication Factors table on page 18. 5 kw x 0.75 = 3.75 kw 3.75 kw x 3414 Btuh/kW = 12,803 Btuh IV DETERMINE FAN SPEED AND POWER REQUIREMENTS AT DESIGN CONDITIONS. Before entering the air delivery tables, calculate the total static pressure required. From the given, Filter Pressure Drop table, the Accessory Electric Heat Pressure Drop table, and the Wet Coil Pressure Drop table, find: External static pressure 0.20 in. wg Filter 0.10 in. wg Electric Heat 0.13 in. wg Wet Coil 0.09 in. wg Total static pressure 0.52 in. wg Enter the table for Dry Coil Air Delivery Horizontal Discharge. At 0.5 in. wg external static pressure and high speed, the motor delivers 1297 cfm. Interpolating for 0.52 in. wg delivers 1276 cfm, which satisfies the job requirements. 8
Cooling capacities 50EES 035 ZP EVAPORATOR CONDENSER AIR TEMPERATURE (F) AIR 85 95 105 115 Cfm BF 1050 0.08 1200 0.10 1350 0.11 F Ewb Capacity MBtuh Compressor Capacity MBtuh Compressor Capacity MBtuh Compressor Capacity MBtuh Compressor Total Sensible kw Total Sensible kw Total Sensible kw Total Sensible kw 72 38.8 18.9 3.65 36.9 18.2 3.83 34.9 17.6 4.02 32.8 17.0 4.20 67 35.7 24.5 3.53 33.7 23.8 3.71 31.7 23.0 3.88 29.7 22.4 4.05 62 32.3 29.6 3.42 30.5 28.7 3.59 28.6 27.7 3.75 26.8 26.7 3.91 72 39.6 19.7 3.74 37.5 19.1 3.92 35.5 18.6 4.11 33.0 17.7 4.27 67 36.2 26.0 3.61 34.2 25.3 3.79 32.1 24.5 3.96 30.1 23.8 4.14 62 33.0 31.5 3.15 31.1 30.5 3.67 29.3 29.3 3.84 27.7 27.7 4.03 72 39.7 20.3 3.80 37.8 19.9 3.99 35.6 19.1 4.17 33.4 18.5 4.36 67 36.8 27.6 3.70 34.6 26.7 3.87 32.5 25.9 4.03 30.4 25.2 4.21 62 33.5 33.2 3.59 31.8 31.8 3.76 30.2 30.2 3.94 28.5 28.5 4.13 50EES 040 ZP EVAPORATOR AIR Cfm BF 1225 0.11 1400 0.12 1575 0.14 F Ewb 72 67 62 72 67 62 72 67 62 85 Capacity MBtuh Total Sensible 46.2 22.1 39.0 25.6 36.3 31.8 47.0 23.0 38.1 25.4 36.5 32.9 47.5 23.9 37.0 24.8 35.9 33.0 Compressor kw 4.19 3.89 3.81 4.28 3.92 3.88 4.37 3.95 3.93 CONDENSER AIR TEMPERATURE (F) 95 105 Capacity MBtuh Compressor Total Sensible kw Capacity MBtuh Compressor Total Sensible kw 43.7 21.2 4.39 41.1 20.3 4.60 38.4 26.1 4.17 36.5 25.7 4.40 34.7 31.5 4.03 32.8 30.8 4.25 44.3 22.1 4.49 41.7 21.2 4.70 40.0 27.2 4.24 36.9 27.2 4.49 35.2 33.2 4.13 33.2 32.6 4.34 44.7 23.0 4.58 41.9 22.0 4.78 38.3 27.8 4.30 37.2 28.5 4.57 35.5 34.5 4.21 33.8 33.7 4.44 115 Capacity MBtuh Total Sensible 38.4 19.4 34.2 25.1 30.5 29.8 38.8 20.3 34.6 26.6 31.3 31.3 39.1 21.1 35.0 28.1 32.1 32.1 Compressor kw 4.81 4.62 4.45 4.89 4.71 4.56 4.98 4.80 4.68 LEGEND BF Bypass Factor Ewb Entering Wet Bulb Idb Leaving Dry Bulb Iwb Leaving Wet Bulb MBtuh 1000 Btuh (NET) 3. The sensible heat capacity is based on 80 F edb temperature of air entering indoor coil. Below 80 F edb, subtract (corr factor x cfm) from the sensible heat capacity. Above 80 F edb, add (corr factor x cfm) to the sensible heat capacity. Correction Factor = 1.10 x (1 BF) x (edb 80). NOTES: 1. Direct interpolation is permissible. Do not extrapolate. 2. The following formulas may be used: sensible capacity (MBtuh x 1000) t = t ldb edw 1.10 x cfm t lwb = Wet-bulb temperature corresponding to enthalpy of air leaving indoor coil (h lwb ) h lwb = h ewb total capacity (MBtuh x 1000) 4.5 cfm Where: h ewb = Enthalpy of air entering indoor coil 9
Cooling capacities (cont) 50EES 050 - ZP EVAPORATOR CONDENSER AIR TEMPERATURE (F) AIR 85 95 105 115 Cfm BF 1400 0.06 1600 0.07 1800 0.08 F Ewb Capacity MBtuh Compressor Capacity MBtuh Compressor Capacity MBtuh Compressor Capacity MBtuh Compressor Total Sensible kw Total Sensible kw Total Sensible kw Total Sensible kw 72 45.0 20.7 4.42 46.7 22.8 4.88 45.5 23.1 5.23 42.6 22.3 5.48 67 43.8 29.4 4.41 43.6 30.8 4.77 41.1 30.1 5.03 38.1 29.2 5.26 62 41.7 37.8 4.34 39.6 37.4 4.60 37.1 36.4 4.85 34.6 34.6 5.09 72 43.2 19.8 4.42 45.9 22.1 4.89 45.8 23.9 5.33 42.9 23.4 5.59 67 42.2 28.4 4.42 45.5 32.1 4.86 41.5 32.0 5.14 38.5 31.2 5.38 62 41.5 38.9 4.42 40.1 39.5 4.72 38.0 38.0 4.98 35.7 35.7 5.25 72 41.5 19.8 4.44 43.6 21.4 4.90 45.1 24.1 5.38 43.2 24.4 5.70 67 40.7 27.6 4.43 42.7 32.1 3.90 41.7 33.7 5.25 38.7 33.0 5.49 62 40.1 37.4 4.44 40.5 40.4 4.83 38.9 38.8 5.12 36.7 36.6 5.39 50EES 060 - ZP EVAPORATOR AIR Cfm BF 1750 0.06 2000 0.07 2250 0.08 F Ewb CONDENSER AIR TEMPERATURE (F) 85 95 105 115 Capacity MBtuh Compressor Capacity MBtuh Compressor Capacity MBtuh Compressor Capacity MBtuh Compressor Total Sensible kw Total Sensible kw Total Sensible kw Total Sensible kw 72 65.5 30.8 6.22 65.0 31.4 6.78 61.7 30.4 7.22 57.9 29.2 7.60 67 62.2 41.7 6.16 58.6 40.5 6.55 55.3 39.0 6.87 51.7 37.8 7.27 62 54.5 48.2 5.80 52.4 47.8 6.21 49.5 46.9 6.60 46.3 45.6 6.97 72 63.4 30.3 6.23 65.3 32.4 6.90 62.5 32.0 7.38 58.5 30.5 7.75 67 63.0 44.1 6.30 59.0 43.2 6.72 55.7 41.2 7.01 52.5 40.4 7.43 62 52.8 47.4 5.82 53.0 50.7 6.35 50.4 49.8 6.76 47.7 47.6 7.17 72 61.2 29.2 6.23 64.3 32.5 6.95 62.9 33.2 7.51 58.9 31.8 7.88 67 63.7 46.5 6.43 60.3 45.7 6.86 56.0 43.2 7.14 52.8 42.9 7.57 62 50.8 46.1 5.84 53.1 52.3 6.47 51.4 51.3 6.93 49.0 49.0 7.37 LEGEND BF Bypass Factor Ewb Entering Wet Bulb Idb Leaving Dry Bulb Iwb Leaving Wet Bulb MBtuh 1000 Btuh (NET) 3. The sensible heat capacity is based on 80 F edb temperature of air entering indoor coil. Below 80 F edb, subtract (corr factor x cfm) from the sensible heat capacity. Above 80 F edb, add (corr factor x cfm) to the sensible heat capacity. Correction Factor = 1.10 x (1 BF) x (edb 80). NOTES: 1. Direct interpolation is permissible. Do not extrapolate. 2. The following formulas may be used: sensible capacity (MBtuh x 1000) t = t ldb edw 1.10 x cfm t lwb = Wet-bulb temperature corresponding to enthalpy of air leaving indoor coil (h lwb ) h lwb = h ewb total capacity (MBtuh x 1000) 4.5 cfm Where: h ewb = Enthalpy of air entering indoor coil 10
UNIT SIZE 50EES ZP 035 040 WET COIL PRESSURE DROP AIRFLOW (cfm) PRESSURE DROP (in. wg) 1000 0.04 1200 0.05 1400 0.07 1600 0.08 1000 0.04 1200 0.05 1400 0.07 1600 0.08 1400 0.07 050 1600 0.08 060 1800 0.09 1700 0.07 1800 0.08 2100 0.09 2300 0.10 FILTER PRESSURE DROP (in. wg) UNIT SIZE 50EES FILTER SIZE (in.) 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 035-040 24 X 24 0.08 0.08 0.09 0.09 0.09 0.10 0.11 0.12 0.14 0.15 050,060 24 X 30 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 ACCESSORY ELECTRIC HEAT PRESSURE DROP (in. wg) HEATER kw 600 800 1000 1200 1400 1600 1800 2000 2200 5 20 0.06 0.08 0.10 0.13 0.15 0.18 0.20 0.23 0.25 11
DRY COIL AIR DELIVERY* HORIZONTAL DISCHARGE UNIT MOTOR SPEED Low 035 Med High Low 040 Med 050 High Low High Low 060 Med High AIR DELIVERY 400 VOLT HORIZONTAL DISCHARGE External Static Pressure (in.wg) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 450 435 420 400 380 335 326 311 1231 1218 1204 1120 1008 950 863 751 470 450 445 410 388 359 338 321 1302 1264 1205 1163 1081 940 873 783 660 635 610 575 540 505 485 460 1700 1660 1581 1450 1297 1190 1095 989 478 458 440 411 378 350 327 317 1303 1270 1224 1179 1126 1022 911 816 481 468 450 428 404 370 338 320 1310 1280 1241 1181 1110 1002 943 811 798 678 647 618 578 540 500 460 1736 1688 1618 1510 1421 1309 1187 1060 801 760 730 688 650 600 570 1898 1841 1757 1682 1564 1429 1365 870 842 818 782 696 632 628 2000 1903 1799 1718 1625 1446 1333 890 850 810 790 735 680 580 480 422 1834 1820 1791 1762 1703 1640 1415 1159 950 1040 1018 1000 950 890 835 790 650 580 2230 2102 2025 1960 1901 1855 1752 1468 1121 1073 2230 1038 2202 1001 2160 NOTES: 1. Do not operate the unit at a cooling airflow that is less than 350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator-coil frost- ing may occur at airflows below this point. 2. Dashes indicate portions of the table that are beyond the blower motor capacity or are not recommended. *Air delivery values are based on, dry coil, without filter or electric heater. Deduct wet coil, filter, and electric heater pressure drops to obtain external static pressure available for ducting. 958 2122 896 2052 840 1926 800 1791 691 1588 575 1202 12
Typical wiring schematic 360/440 3 50 13
Typical field wiring (cont) C W1 W1 TO UNIT POWER WIRING BRN (COMMON) VIO (STEP 2) WHT ( STEP 1) BLK YEL CONTACTOR 2 BRN YEL YEL FUSE BLOCK F3 YEL L2 F4 YEL L1 F1 BLK F2 BLK CONTACTOR 1 BRN YEL YEL YEL YEL EL 1 EL 2 EL 3 AUTO-LIMIT BLK BLK BLK Typical Electric Heater Diagram 14
Electrical data UNIT 50EES NOMINAL VOLTAGE (V-Ph-Hz) VOLTAGE RANGE COMPRESSOR OFM IFM ELECTRIC HEAT POWER SUPPLY Min Max RLA LRA FLA FLA 035 - ZP 400 3 50 360 440 5.8 39 1.5 2.8 040 - ZP 400 3 50 360 440 6.3 45 1.5 2.8 050 - ZP 400 3 50 360 440 6.6 53 1.5 4.2 060 - ZP 400 3 50 360 440 9.0 79.0-1.4 6.2 Nominal kw* / 3.8 7.5 / 3.8 7.5 / 3.8 7.5 / 3.8 7.5 FLA / 7.5 15.3 / 7.5 15.3 / 7.5 15.3 / 7.5 15.3 MCA 15.4/15.4 17.8/19.9 31.9/36.2 15.4/15.4 17.8/19.9 31.9/36.2 21.1/21.1 21.1/21.1 31.3/35.3 29.7/29.7 29.7/29.7 33.8/37.8 MAX FUSE OR CKT. BKR. 25/25 25/25 35/40 25/25 25/25 35/40 25/25 25/25 35/40 35/35 35/35 35/40 MOCP LEGEND FLA Full Load Amps HACR Heating, Air Conditioning and Refrigeration IFM Indoor (Evaporator) Fan Motor LRA Locked Rotor Amps MCA Minimum Circuit Amps MOCP Maximum Overcurrent Protection NEC National Electrical Code OFM Outdoor (Condenser) Fan Motor RLA Rated Load Amps *Heater capacity (kw) is based on heater voltage of 208 v, 240 v, or 480 v. If power distribution voltage to unit varies from rated heater voltage, heater kw will vary accordingly. Fuse or HACR circuit breaker. NOTES: 1. In compliance with NEC requirements for multimotor and combination load and equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker. 2. Unbalanced 3-Phase Supply Voltage Never operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the following formula to determine the percentage of voltage imbalance. % Voltage Imbalance max voltage deviation from average voltage = 100 x average voltage Example: Supply voltage is 460-3-60 AB = 452 v BC = 464 v AC = 455 v 452 + 464 + 455 Average voltage = 3 = 457 Determine maximum deviation from average voltage: (AB) 457 452 =5v (BC) 464 457 =7v (AC) 457 455 =2v Maximum deviation is 7 v. Determine percentage of voltage imbalance: 7 % Voltage imbalance = 100 x 457 = 1.53% This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%. IMPORTANT: If the supply voltage phase imbalance is more than 2% contact your local electric utility company immediately. 15
Operating sequence COOLING NOTE: With the FAN switch in the ON position, 24 v is supplied to the time-delay relay (TDR) through the G terminal on the thermostat. This voltage energizes the coil of the relay, closing the normally-open set of contacts which provide continuous power to the indoor (evaporator) fan motor (IFM). Moving the FAN switch back to the AUTO position (providing there is not a call for cooling) deenergizes the TDR (when applicable) which deenergizes the IFM after a 30-second delay. The FAN switch in AUTO position cycles upon a call for cooling. On a call for cooling, 24 v is supplied to the compressor contactor (C) and TDR simultaneously through the Y and G terminals of the thermostat, respectively. On units with a compressor TDR, there is a built-in, 5-minute (±45 seconds) delay between compressor starts. Energizing the contactor closes the normally-open set of contacts supplying power to both the compressor and outdoor (condenser) fan motor (OFM). Energizing the TDR closes the normally-open set of contacts providing power to the IFM. On the loss of the call for cooling, 24 v is removed from both the Y and G terminals of the thermostat (providing the FAN switch is in the AUTO position), deenergizing both the compressor and TDR and opening both the contacts supplying power to compressor/ofm. IFM has a 30-second delay. HEATING When power is supplied to unit, transformer (TRAN) is energized. On units with crankcase heater (CH), heater is also energized. With thermostat set to call for heating, sequence of operation is as follows: On a call for heat, circuit R-W and R-G are made through firststage thermostat bulb. If accessory electric heaters are used, a relay is energized, bringing on first stage of supplemental electric heat and fan. When thermostat is satisfied, contacts open, deenergizing relay (on all units) and time-delay relay (on units equipped with time-delay relay). Heaters deenergize, and evaporator fan stops after a 30-second time delay (on units equipped with time-delay relay). Typical Installation INDOOR THERMOSTAT RETURN AIR TOP COVER FROM POWER SOURCE Power Wiring Control Wiring Condenser Airflow Evaporator Airflow POWER AND LOW-VOLTAGE ENTRY COMPOSITE RUST-PROOF BASEPAN CONDENSATE DRAIN CONNECTION *Separate disconnect per NEC (National Electrical Code) required for electric heater when singlepoint conection is not used. DISCONNECT PER NEC* (UNIT AND ELECTRIC HEATER) C00008 16
APPLICATION DATA ACCESSORY ELECTRIC HEATERS ODS CATALOG NOMINAL USED WITH SIZES ORDERING NO. CAPACITY (kw) 035 040 050 060 ELECTRIC HEATERS (400 v 3 PHASE 50 Hz) CPHEATER034A00 5.0 X X X X CPHEATER035A00 10.0 X X X X LEGEND ODS Order Distribution System NOTE: Electric heaters are rated at 480 v. Refer to Multiplication Factors table below for voltages in other applications. MULTIPLICATION FACTORS HEATER kw RATING 450 VOLTAGE DISTRIBUTION V/3/60 MULTIPLICATION FACTOR 400 0.75 440 0.84 460 0.92 480 1.00 Example: 10.0 kw (at 480v) heater on 400 v = 10.0 (.75 mult factor) = 7.5 capacity at 400 v 17
Engineers specification guide GENERAL: Furnish and install outdoor package, electrically controlled, air conditioner utilizing a reciprocating compressor for cooling duty. Unit shall discharge supply air horizontally. Nominal unit electrical characteristics shall be v, ph, 50 Hz. The unit shall be capable of satisfactory operation within voltage limits of v to v. Unit power wiring shall enter unit cabinet at a single location. Separate power supply shall not be required for electric heat. COOLING CAPACITY: Total cooling capacity of the unit shall be Btuh or greater, and sensible capacity shall be Btuh or greater at conditions of cfm indoor air entering unit at F dry bulb, F wet bulb and outdoor entering air of F dry bulb. Total design conditions shall be a minimum of Btuh/Watt. The unit shall be capable of cooling operation down to 40 F as shipped from the factory. CABINET: Unit cabinet shall be constructed of galvanized, minimum spangle G90, powder painted steel. Basepan shall be made of a single-piece non-corrosive, composite material. Evaporator-fan compartment interior cabinet surfaces shall be insulated with a minimum 1/2-in. thick, flexible fiberglass insulation, coated on the air side with aluminum foil. Cabinet panels shall be easily removable for servicing. Outdoor coil shall be protected by metal louvered panels. COMPRESSOR: Compressor shall be fully hermetic type with internal and external vibration isolation. CONDENSER SECTION: Condenser fan shall be of the direct-driven propeller type with aluminum blades, riveted to corrosion-resistant steel spiders, and shall be dynamically balanced and discharge air vertically upwards. Condenser coils shall have aluminum-plate fins mechanically bonded to seamless copper tubes with all joints brazed. Tube sheet openings shall be belled to prevent tube wear. EVAPORATOR SECTION: Fan shall be 2- or 3-speed with direct drive motor as shown on the equipment drawings. Fan wheel shall be made from steel, be double-inlet type with forward-curved blades with a corrosion-resistant finish and dynamically balanced. Evaporator coils shall have aluminum-plate fins mechanically bonded to seamless copper tubes with all joints brazed. Tube sheet openings shall be belled to prevent tube wear. MOTORS: Compressor motors shall be of the refrigerantcooled type with line break thermal and current overload protection. All fan motors shall have permanently lubricated bearings, and inherent automatic reset thermal overload protection. Condenser fan motor shall be open drip-proof. REFRIGERANT SYSTEM: Refrigerant system shall include fixed orifice metering system. CONTROLS: Unit shall be complete with self-contained lowvoltage control circuit. APPROVALS: Unit shall be UL listed as a total package for safety requirements. All wiring shall be in accordance with NEC. Unit shall be rated in accordance with ARI Standards 210/240 89 and 270-84. Cabinet insulation shall conform to ASHRAE No. 62P. Insulation and adhesive shall meet NFPA 90A requirements for flame spread and smoke generation. Unit shall have a sloped drain pan that conforms to ASHRAE Standard 62-89. ACCESSORIES: Field-installed accessories shall include solid-state compressor short-cycle device, outdoor thermostat, thermostat and subbase, electric heaters with single-point connection, crankcase heater, low- and high-pressure switch kits, and low-ambient kit. 18
NOTES 19
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations 2008-02 PD